Are you often face this embarrassing situation? When you try to screw the nut find the bolt has much burr. Usually you will take arduous hammer to hit it to be tapered edge. This Saker Deburring External Chamfer Tool for Drill Bitis designed to solve this problem for you. Made of super hard stainless steel with 3 shaving teeth and hexagon shaped shaft which keeps the deterring from slipping while working with drill bit. It's designed to clean up any kind of threads or end of pipe that might have burrs and let nut easily slide over the bolt.